Tungsten is the world's rare a non-ferrous minerals, the annual output is very low, use very extensive, mainly used for casting ingredients with raw materials. Tungsten comes from a white sand mold ore bodies, ore line special tiny, after mining, grinding, water re-election, refining and multichannel process, get grade reached more than 95% of the tungsten powder, and then after high temperature furnace refining molding production of finished product is tungsten bars. Tungsten melting point: 3500 ℃. At present tungsten ore are mainly distributed in China and Russia, China is now the world's largest exporter of tungsten. Usually the purity of tungsten rod should be in more than 99.98%